package com.test.thread;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/***
 * 多线程之间按照顺序调用 A--》B--》C
 * 实现 A打印 5次，B 打印 10次，C打印 15次
 * 紧接着 A打印 5次， B 打印 10次，C打印 15次
 * 。。。
 */
public class SyncAndLockDemo {
    public static void main(String[] args) {
        ShareResource resource = new ShareResource();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                resource.print5();
            }
        },"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                resource.print10();
            }
        },"B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                resource.print15();
            }
        },"C").start();
    }
}

//资源类
class ShareResource{

    private int number = 1; //A:1 B:2 C:3
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();

    //1.判断
    public void print5(){
        lock.lock();
        try{
            while (number != 1){
                c1.await();
            }
            //2.干活
            for (int i = 0; i < 5; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.唤醒
            number = 2;
            c2.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public void print10(){
        lock.lock();
        try{
            while (number != 2){
                c2.await();
            }
            //2.干活
            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.唤醒
            number = 3;
            c3.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public void print15(){
        lock.lock();
        try{
            while (number != 3){
                c3.await();
            }
            //2.干活
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.唤醒
            number = 1;
            c1.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }

}
